Machine for winding filaments



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#Trop/Vey Feb. 28, 1956 A. z. slDoRowlcz MACHINE FOR WINDING FILAMNTS 5 Sheets-Sheet 2 Fi-led March 27, 1953 IN1/Euro1: Z. lboRo w/cz #non Nev Feb. 28, 1956 A. z. sxDoRowlcz MACHINE FOR WINDING FILAMENTS 5 Sheets-Sheet 3 Filed March 2'?, 1953 LU lil HZ. /ooRow/Z By /M//f 24m #from/EY Feb. 28, 1956 A, z SIDORQWlCZ 2,736,343

MACHINE FOR WINDING FILAMENTS Filed March 27, 1953 5 Sheets-Sheet 4 S0.. f l

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MACHINE FOR WINDING FILMENTS Filed MarCh 27, 1953 5 Sheets-Sheet 5 om vm@ MN/mm @www wz w/ IT W .H mm @w o QH E. ovww w S Z sm Hm @mf/xm x 0, m mmLQ @DE Sv XJ Q Nq mw @l ATTORNEY United States Paten-t O MACHINE FOR WINDING FILAMENTS Alexander Zbigniew Sidorowicz, Montreal, Quebec, Canada, assignor to Northern Electric Company, Limited, Montreal, Quebec, Canada, a corporation of Canada Application March 27, 1953, Serial No. 345,200 8 Claims. (Cl. 140'x-71.5)

The .principal object of this invention is to provide a device for continuously convoluting a series of filaments.

Another object of this invention is to provide a device which will continuously convolute a series of filaments having coiled sections spaced apart by looped sections.

A further object of this invention is to provide a device for continuously co-nvolut'ing a series of filaments on a plurality of individual pairs of mandrels.

Another object of this invention i's t-o vprovide a high speed winding machine.

A further object of this invention is to provide a device for valternatively automatically changing the winding of a 'filament from one form to another.

v in 'the present embodiment of the invention, the device may be considered to consist of four 'drives driven from the main shaft, which are the master timing drive which controls the timing of the other three drives, the differential drive to change 4the coiling action to the looping action, the coil pitch `drive to control the pitch of the coils, and the indexing drive to move the indexing head a predetermined distance 'to the next position, these actions being controlled through a series of electrical switches and associated cams.

A better understand-ing Iof the Vinvention may be had by referring to lthe 'following `description taken in conjunction with the drawings, in which Vlike numerals refer to like parts, in which: s

Fig. 1 shows a plan view of 'the device in which the invention is incorporated;

Eig. 2 represents a plan view, partly in section, of the winding portion of the device;

Fig. 3'i s a view in eleva-tion taken at the line 3 3, in the direction of the arrows, Fig. lg;

Fig. 4 shows fa plan view, part-ly in section, taken at the line 4&4, in the direction of the arrows, Fig. 2;

Fig. 5 shows a view, in elevation, taken at the lines S-S'in the direction 'of the arrows, Eig.. 1; s

Fig. 6 shows the uA and the single, double, triple coiled forms which4 the filamentl may assume;

fFig. 7 shows a plan View, partly broken away, of the indexing. mechanism Aformin'gpart ofv the device;

Fig. 8A is a view in elevation, taken at the lines S-r8 in thedirecti'on of the arrows, Fig. 7;

Eig. .9. shows the trajectory followedv by thel filament 'during' its travel from a ceiling to. a looping position;

Fig.Y 10- shows. ak schematic. wiring diagram illustrating the electrical connections used in the device;

Eig. ll shows aschematic diagram ofl the device in which the invention, is incorporatedt The. specific devicet'o, be described intendedt to be ICC used for the manufacture of incandescent lamp 'lament, the latter being of the c'oiled or looped formation.

Referring -to the drawing, vthe driving sprocket 1 is secured to the main shaft 2 which may be `driven by a chain 3 from an electric motor (not shown). The speed reduction gears 4, 5, 6, 7, Vintermesh with the gears 8, 9, 10, 11, the speed reduction therewith being 126-1; gear 5 is secured to gear 6, gear 8 to gear 9 and gear 10 to gear 11. The barrel cam 12 is equipped with a rcam slot 13 and a hub 16 with 'a circular slot 15, the arm 14 'being in s'lidable engagement therewith, 'the arm 14 being pivoted at the point 17 and provided 'with the cam lfollcwver 18. The cams 19 and 20 are secured to the barrel clam 12 which are suitable fory engagement with the microswitc'hes 21, 22 respectively. The gears 8,'9, 10, 1-1 revolve on the shaft 23. The hub 16 revolves on shaft 23.

As shown better in Fig. 4, the bevel lgear 24is secured to shaft 23, the gear 24 meshing with the pinions 25, 26, 27 (26, 27 not being shown), these pinions being carried by Vthe spider gear 28, the pinions 25, 26, 27 being set therein by the pin 29. Bevel gear 30, which revolves on shaft 23 and also meshes with the pinions 25, y26, 27, is secured to -hollow shaft 31 vwhich revolves on the needle bearing 32. Hollow shaft 31 is provided with the internal ring gear 33 which meshes with spur pinion 34 which drives the shaft 35 the extreme end of which is provided with an opening 36, in which a supply of filament material 37 may be inserted, and an arm 38 for guiding the filament material. Shaft 23 is vpinned lto shaft 39 by pin 40, shafts 23 and 39 'rotating within the shaft 31, while shaft35 revolves within shaft 39 on the bearings 41, 42.

The shaft 31 is provided with the engaging tins 43 and 44 and shaft 39 with engaging groove 45.

The selector switch 46is electrically connected tomicroswitches 21, 22, 47 and 48, 49 and 50, 51 and 52, Fig. 1.0, which are actuated by the cams 19, 2t), 53, 54, 55, respectively, Figs. 1 and l0. Each of the cams 53, 54, `55 is composed of two cam plates 56 and 57 for cam 53, Fig. 3, the other not being shown, which operates pairs of the microswitches 47 'and 48, 49 'and 50, 51 and 52, connected in series.. These switches are in turn electrically connected vto the solenoids 5S, 59, 60, these solenoids being the same in construction. A detail of solenoids 59 and 60 is shown Vin Fig. 5. Each solenoid v'58, 59, 60 is 'equipped with an arm 6.1, 62 and 6,3 respectively each being spring tensioned so 4that when the solenoids are in the normal or inoperative position arm-s 61, 62 are in engagement with groove 45 and fin 43 or 44 respectively Iand arm 63 is out of engagement with shaft 39. Each of the cams 55, 54, 53 are individually mechanically connected to the `timing gears V64, 65, 66 respectively, telescopically through hollow shafts 67, 68, '69, gear 66 being meshed -directly with gear 70, gears 64, 65 meshing with gear 70 through intermediate gears 71, 72 respectively. A slipping clutch having the engaging elements 73, 74 spring tensioned by spring 75 adjustable by knob 76 and vthread 7'7", engages the gear 70 with shaft 2 by the action of elements 73, 74. The shafts 2 and 23, 39 and gear 70 are supported in the bearings 78, 79 and Si) respectively.

The indexing mechanism consists of table 81 rotatably mounted, pairs of pins 82 and 83 rotatably movable with the vtable 81 and secured to the table 81 is the plate lS4 having the slots 85, while the disc 86 is equipped with pin 87 to engage with slots 8'5, the disc 86 being driven by worm and worm gear 88 by flexible shaft 89 from the gear 90 being in mesh with gear 4, the connection between the shaft 89 and the gears 88 and 90 being by any suitable means which are available. Associated with the disc 86 s is the pivoted locking arm 91 which is under spring tenspring 93, having-movable arm 94 and shaft 95 adaptable to oscillate the arm 96 with the associated applicator 97, 98 being a container for the material 99 to be applied. Magazine 100 is provided to contain carbon blocks 101, these blocks being inserted between pins 82 and 83 by means of handle 102 in association with the plate 103. The plate 103 may consist of a rectangular piece of suitable metal provided with a cut-away which engages the carbon blocks 101 to move them forward. The levers 104, 105 permit the releasing of the bottom pins 83, the :releasing mechanism being any suitable means for this purpose. Energy is supplied to the electrical circuit from power input 106 through leads 107, 108, 189 and 110, these wires being in cable form 111, 112 and held in position by brackets 113, 114 and 115.

In the operation of the device a supply of filament niaterial 37 is placed in the housing 36 in the rotating shaft 35, the material then being placed in the eye of the arm 38 and the end of the material then being secured to top of table 81 and bottom pin 83 by suitable means such as with Wax or Scotch tape. During the operation of the device, in which the forming of the filament proceeds from left to right so that arm 38 is in the forward position at the start of the operation, the filament 37 is first wound around the bottom pin 83, which may be called the coiling operation, the filament then being brought up around the upper pin 82, which may be called the looping operation. The selector switch 46 is set to control the ltype of filament required, i. e., single, double or triple coils or coilless, by selecting a pair of microswitches 51 and 52 or 49 and 50 or 47 and 48, the slipping clutch connecting the driving elements, to the driven part of machine, by the elements 73 and 74. Each of the solenoids 58, 59, 60, before the start of the device, are deenergized `so that their arms 61, 62 are engaged in the groove 45 and fins 43 or 44 respectively with respect to `solenoids 58, 59, while arm 63 is disengaged from shaft 39 with respect to solenoid 60. It is assumed that switch 46 is set on position 1.

The device is driven by the chain drive 3 transmitting power from the motor to the main shaft 2 through the sprocket 1. In operating, the device may be said to perform four principal functions, the coiling and looping of the filament, the control of the pitch of the filament between coils, the indexing to intermittently rotate the indexing ltable a predetermined distance to the next position and the timing. For these purposes there are four principal drives, these being the master timing drive, the stop differential drive to change from the coiling to the looping of the filament, the barrel cam drive to control the pitch of the filament, and the indexing drive.

With the start of the device, solenoid 59 is energized, the circuit being from power input 106, break contacts 2, 3 of microswitch 21, terminal 1 of selector switch 46, conductor 110, break contacts 1 and 2, microswitch 51, break contacts 1, 2, microswitch 52, solenoid 59, conductor 107, power input 106. Both solenoids 5S and 60 remain de energized, the circuit being broken at the make contacts 2, 3 and 1, 2, of microswitches 51 and 21 respectively, so that arm 61 of solenoid 58 is engaged with groove 45 thu-s preventing shaft 39 from rotating while arm 63 of solenoid 60 is out of engagement with shaft 39. n

The operation of the solenoid 59 permits its arm 62 to disengage from fin 43 or 44, allowing shaft 31 to be rotated on bearings 32. The rotation of shaft 31 results from the driven shaft 2 driving gear 70 through clutch elements 73, 74, gear 70 driving differential spider gearing 28 which in turn drives gear 30 and shaft 31 as a unit. Shaft 31 rotates spur pinion 34 through ring gear 33, spur pinion 34 rotating shaft 35, which rotates within shaft 39, and

arm 38 as a unit allowing the filament material 37 to be coiled on the bottom pin 83 of the indexing mechanism. During the coiling operation shaft 39 and connected shaft 23 and gear 24 remain locked against rot-ation due to the arm 61 of solenoid 58 being in enga gement With groove 45 Arm 38 will continue to rotate to coil the lament mate- `rial, the number of coils per filament being controlled by the cam 55, in association with gear 64, until cam 55 reaches the point where microswitch 51 operates and opens its break contacts 1, 2 and closes its make contacts 2, 3 thus allowing solenoid 59 to deenergize so that arm 62 is engaged with fin 43 or 44 which stops shaft 31 together with shaft 35 and arm 38 from rotating.

The closing of the make contacts 2, 3 of switch 51 allows solenoid 58 to be energized, the circuit being from power input 106, break contacts 2, 3, microswitch 21, terminal 1 of selector switch 46, make contacts 2, 3 of switch 51, solenoid 58, conductor 107 to power input 106, the operation of solenoid 58 permitting its arm 61 to disengage with the groove 45, thus allowing the shaft 39 with connected shaft 23, and bevel gear 24 to rotate as a unit. it will be perceived that if the selector switch 46 was set on positions l, 2 or 3 so that either switches 51 and 52, 49 and 50 or 47 and 48 were selected that the associated gears 66, 65 or 64 will determine the number of coils wound in view of the different gear-ratios between the gears 66, 65, 64 and gear 70 respectively.

The rotation of the shaft 39 gives a looping movement to the arm 38 to carry the filament over theupper pin 82 and then back to the lower pin 83. The hollow shaft 31 being held stationary by the arm 62 of solenoid 59, being in engagement with iin 43 or 44, permits the spur pinion 34 to revolve on the ring gear 33, thus allowing the shaft 35 to rotate within shaft 39. The combination of the rotation of the shaft 39 with the rotation of shaft 35 gives a flat loop so that a uniform linear speed of the winding and looping operation results which prevents {ilament breakage. The trajector produced by these movements are illustrated in Fig. 9. When the looping operation is completed the cam 55 again closes the break con tacts 1, 2 and opens the make contacts 2, 3 of microswitch 51, the coiling operation then proceeding. The other two pairs of switches 49 and 50 or 47 and 48 behave in a similar manner in the case where the selector switch 46 is set on positions 2 or 3 the only difference being in the producing of 2 or 3 coils instead of one as described heretofore. The action of microswitches 48, 50 and 52 will be explained hereinafter.

Simultaneously with the coiling and looping action, the arm 38 is moved away from the indexing table 81 to establish the pitch of the coils. This action takes place by reason of the arm 14 of the barrel cam 12 actuating the hub 16 by means of the cam slots 13, cam follower 18 which in turn moves the shafts 23, 31, 39 as a unit, the spider gear 28 sliding along the gear 70.

The coiling and looping operations continue until the pins 82, 83 are filled with the completed filaments at which time arm 38 has moved a predetermined distance away from the indexing table 81.

Since the last operation, when the pins 82, 83 are filled, is a coiling operation, the arm 38 is in a bottom position beneath the lower pin 83 with a result that if the arm 38 was allowed to return to its forward position to commence a new cycle of operations on a new set of pins in the bottom position, after table 81 has indexed, the filament material carried between two sets of pins during indexing would be broken by the action of the applicator 97, which is operated in an upward movement, when the completed sets of filaments have been moved to that position, damaging the filaments which have been formed. In order to prevent this, the filament material 37 is carried over the tops of upper pins 82. This is accomplished by the cam 19 opening, at this point of operation, that is, when the pins 82, 83 have been lled with completed filaments, contacts 2, 3 of the microswitch 21 so that solenoids 58, 59 are deenergized allowing their arms 61, 62 respectively to engage in groove 45 and in iin 43 or 44 so that the rotation of the shafts 39 and 31 is prevented, the clutch elements 73, 74 slipping to prevent any driving action.

arranges .Since contests 1., 2 Qf lriiroswitch 21 have also been Closed by this. operation., Solenoid@ is, energzedithe cir- Cuit being from Power. input 1.06 contacts 1. 2 micro,- switch .21, conductor 109 solenoid 60, conductor 107, power input 106 witha result that its arm 63 standspoised ready to engage with groove 45 when the shaft 39 has rotated t0 that position., At this. point of operation., cam 20, momentarily closes contacts, v1.2 of microswitch 22, s0 that solenoid 58 -is energized with a result that its arm 61 is disengaged from ,the groove 45 permitting the shaft 39l to rotate to the point where arm 634 of solenoid 60 will be engaged with groove 45. The circuit `for the operation of solenoid 58 is from power ,input 106, contacts 1, 2 microswitch 22, conductor 1.08, solenoid 58, conductor 107 to power input 106. This operation allows arm 38 to rotate 180 degrees which carries the filament material 3,7 ,to the upper pin 82 of the set, on which the completed filaments have been formed, whereupon the rotation of shaft 39 is stopped bythe arm 63 yof* solenoid .60 engaging with the groove 45.

At this point of operation arm 38' with shafts 31, 39, 23 will move longitudinally, bythe action of cam 12, causing these shafts to slide as units along gear 70 and differential 28, to its forward position. Simultaneously therewith the indexing table S1 will be rotated so that a new set of pins 82., A83 will be presented to the arm 38. This latter action results from the table 81 being rotated by means of flexible shaft 89 which is driven by gear 90 through gear 4 which drives discs 86 through worm gearing 88, pin 87 on disc 86 engaging with slot 85 on plate 84 to rotate table S1, the disc 86 being released by locking arm 91., which held the plate 84 against rotation during the coiling and looping operations, sliding out of slot 85. This operation therefore carries the filament material 37 across the top of upper pin 82, of the pair of pins on which a set of filaments has been formed, then over the top of the next succeeding upper pin 82 and at the forward position on which a new .series of filaments are to be formed.

At the above point of operation, cam 19 opens contacts 1 and 2 and closes contacts 2, 3 of microswitch 21 so that solenoid 60 is deenergized so that its arm 63 .disengages from groove 45. Since arm 61 of solenoid 58 is out of engagement with groove 45, shaft 39 will continue to rotate 180 degrees thus bringing the arm 38 to the bottom and commencing position below lower pin 83 whereupon a new set of filaments ,may be formed.

It may so happen, during the last rotation of shaft 39 which carried the filament material 37 from the upper pin 82 of a new set of pins to the base of lower pin 83 thereof, as described above, that cams 53, 54 or 55 may be on such a point that contacts 1,2 of microswitch 51 may `become engaged so that a .circuit is closed from power input 106, contacts 2, 3, microswitch 21, position 1, selector switch 46, contacts 1, 2, microswitch 51, solenoid 59, conductor 107, power input 106 which would allow solenoid .59 to become energized allowing arm 62 to be released from lin 43 or 44, allowing both shaft 39 and shaft 31 to rotate simultaneously resulting in disaster for the device. To prevent this, each of the cams 53, 54, 55 is composed of two plates, as for example, plates 56, 57 of cam 53 (Fig. 3), so that both contacts 1, 2 of microswitches 51, 52 or 49, 50 or 47, 48 are opened by the cams 53, 54, 55 during this operation which prevents both solenoid 58, 59 being energized at the same time.

When the completed filaments on pins 82, 83 are moved to the next position, the operator inserts a carbon block 101 between the pins 82, 83 by actuating handle 102, Fig. l.

On the next movement of the indexing table, the completed set of filaments, with the carbon block 101 inserted I between pins, is presented to the compound container 98 whereupon the applicator 97 applies the material 99 to the, pmpleted filaments Ibis action is dus f0- dic 8i aptuating' slider-92 -to reoperate arms 94, 96.

"Uponthe next movement of vthe 'indexing table,- :the treated filaments are moved tothe next position whereupon the operator separates thefilaments'by manually applying a cutting'instrument along the upper 'pin 82 which `vis permanently set in the indexing table. vThe operator then configuration, the selector-switch 46 is set on contact "i4 so that a circuit is completed from the power input 106, contacts 2, 3, microswitch '21, selectorswitch 46, conductor 168, solenoid 53., conductor 107power input `so that arm 61 of solenoid 58 ldisengasges from 4groove '45 allowing lshaft 39 to rotate so that the filament :is wound between the two pins '82 8,3, the operation continuing as described above.

What is claimed is:

l. A device for continuously convoluting filaments composed kof spaced coiled and looped sections on a pair of'stationary mandrels, comprising: a winding unit assembly having a pair of rotatable hollow shafts in extended relation, a winding shaft in internal krotatable engagement with the first shaft and rotating eccentrically withinthe other, a winding arm eccentrically disposed thereon and extending externally from the other shaft and a dfferential'means including a spider gearing therefor arranged 'to rotate the hollow shafts independently of each other, a driving assembly; a rotatable element in slipping engagement therewith and in operable engagement with the gearing and slidable therealong; means to control the rotation of the shafts comprising .an electrically energized circuit having therein a pair of electromagnetic devices individual thereto and in yieldable engagement with stops on the hollow shafts when deenergized, a pair of switching elements, a cani actuated by the rotatable element engaging with the first of the elements arranged in time relation therewith to alternatively complete the circuit to a device and a second cam actuated in speed reduction by the driving assembly engaging the other element arranged in time relation therewith to disable the circuit, when a predetermined number of filaments have beenformed, for a predetermined time; a reciprocable assembly rotated coaxial'ly therewith in movable engagement with the winding assembly arranged to impart a pitch to the filaments and to return the arm to its forward position during the said predetermined time. y y A 2. A device in accordance with claim l having in combination therewith a plurality of said first switching elements and a plurality of said cam in individual engagement therewith actuated by said rotatable element atdifferent relative speeds, an additional switching element Vso arranged to include a selected said first switching element in the said circuit. p

3. A device for continuously convoluting .filaments composed of spaced coiled and looped ysections on a pair of stationary mandrels, comprising: a winding unit assembly having a pair of rotatable hollow shafts in extended relation one of which having a ring gear disposed therein, a winding shaft in operable engagement with the gear and rotating eccentrically within the other, a winding arm eccentrically disposed thereon extending externally from the other shaft, and a differential means including a spider gearing therefor arranged to rotate the hollow shafts independently of each other; a driving assembly; a rotatable element in operable engagement with the gearing and slidable therealong; a slip clutch between the driving assembly and the rotatable means; means to control the rotation of the shafts comprising an electrically energized circuit having therein a pair of electromagnetic devices individual thereto and in yieldable engagement with stops on the hollow shafts when deenergized, a pair of switching elements, a cam actuated by the rotatable element engaging with the first of the elements arranged in time relation therewith to alternatively complete the circuit to a device and a second cam actuated in speed reduction by the driving assembly engaging the other element arranged in time relation therewith to disable the circuit, when a predetermined number of filaments have been formed, for a predetermined time; a reciprocable assembly rotated coaxially therewith in movable engagement with the winding unit assembly arranged to impart a pitch to the filaments and to return the arm to its forward position during the said predetermined time.

4. A device in accordance with claim 3 having in combination therewith a plurality of said first switching elements and a plurality of said cams in individual engagement therewith actuated by said rotatable element at different relative speeds, an additional switching element so arranged to include a selected said first switching element in the said circuit.

5. A device for continuously convoluting filaments composed of spaced coiled and looped sections on pairs of stationary mandrels disposed on an indexing mechanism; comprising a winding unit assembly having a pair of rotatable hollow shafts in extended relation, a winding shaft in internal rotatable engagement with the first shaft and rotating eccentrically with the other, a winding arm eccentrically disposed thereon and extending externally from the other shaft and a differential means including a spider gearing therefor arranged to rotate the hollow shafts independently of each other; a driving assembly; a rotatable element in operable engagement with the gearing and slidable therealong; means to control the rotation of the shafts comprising an electrically energized circuit having thereon a pair of electromagnetic devices individual thereto and in yieldable engagement with stops on the hollow shafts when deenergized, a pair of switching elements, a cam actuated by the rotatable elements engaging with the first of the elements arranged in time relation therewith to alternatively complete the circuit to a device and a second cam actuated in speed reduction by the driving assembly engaging the other element arranged in time relation therewith to disable the circuit, when a predetermined number of filaments have been formed, for a predetermined time; a reciprocable assembly rotated coaxially therewith in movable engagement with the winding unit assembly arranged to impart a pitch to the filaments and to return the arm to its forward position during the said predetermined time; and means actuated by the driving mechanism in engagement with the mechanism to simultaneously therewith index the mechanism during the predetermined time.

6. A device in accordance with claim 5 having in combination therewith a plurality of said first switching elements and a plurality of said cam in individual engagement therewith actuated by said rotatable element -at different relative speeds, an additional switching element so arranged to include a selected said first switching element in the said circuit.

7. A device for continuously convoluting filaments composed of spaced coiled and looped sections on pairs of stationary mandrels disposed on an indexing mechanism; comprising a winding unit assembly having a pair of rotatable hollow shafts in extended relation, a winding shaft in internal rotatable engagement with the first shaft and rotating eccentrically with the other, a winding arm eccentrically disposed thereon and extending externally from the other shaft and a differential means including a spider gearing therefor arranged to rotate the hollow shafts independently of each other; a driving assembly;

a. rotatable element in operable engagement with theV gearing and slidable therealong; means to control the rotation of the shafts comprising an electrically energized circuit having thereon a pair of electromagnetic devices .individual thereto and in yieldable engagement with stops on the hollow shafts when deenergized, au additional electromagnetic device arranged to be out of engagement when deenergized with the stop on the other shaft and at a predetermined distance therefrom, a pair of switching assemblies, a cam actuated by the rotatable elements engaging one of the switching assemblies arranged in time relation therewith to alternately complete the circuit to a device of the pair, a second cam actuated in speed reduction by the driving assembly engaging the other element arranged in time relation therewith to successively exclude from and include .in the circuit the pair of devices and the additional device respectively, after a predetermined number of filaments have been formed, to momentarily include the other shaft and after a predetermined time to restore the circuit to its original state; a reciprocable assembly rotated coaxially therewith in movable engagement with the winding unit assembly arranged to impart a pitch to the filaments and to return the arm to its forward position during the said predetermined time; and means actuated by the driving mechanism in engagement with the mechanism to simultaneously therewith index the mechanism during the predetermined time.

8. A device in accordance with claim 7 having in combination therewith a plurality of said first switching elements and a plurality of said cams in individual engagement therewith actuated by said rotatable element at different relative speeds, an additional switching element so arranged to include a selected said first switchr ing element in the said circuit.

References Cited in the file of this patent UNITED STATES PATENTS 1,637,037 De Jong July 26, 1927 2,053,764 Chapman Sept. 8, 1936 2,443,914 Jarman June 22, 1948 2,453,749 Hilsinger Nov. 16, 1948 2,553,506 Richard Dec. 12, 1950 FOREIGN PATENTS 314,843 Great Britain July 3, 1929 

